The various engine stampings are discussed in the factory TSBs. As a general rule, they appear in one of the first TSBs issued for Chapter 25.
I do not have them available for all years, but since a 1971 engine was shown above, here is a link to those pages from the Chrysler, Plymouth & Imperial set;
For Dodge or other model years go to http://www.hamtramck-historical.com/library.shtml & find the model year that interests you & find the TSBs in the grid menu, then look at Chapter 25 for those I have.
